Model: ST3000DM001
P/N: 9YN166-306
FW: CC4H
Site: TK
SN: Z1F
# of heads: 6 (0,1,2,3,4,5)

Symptom: Drive clicks
Cause: Head crash, ring in platter, dirty heads, black filter
Solution: Unrecoverable

Model: ST2000DM001
P/N: 9YN164-500
FW: CC4B
Site: SU
SN: W24
# of heads: 5 (0,1,2,3,4)

Symptom: goes busy while accessing sectors
Cause: damaged glist, bad sectors
Solution: cleared glist

Model: ST2000DM001
P/N: 1CH164-501
FW: CC24
Site: TK
SN: Z1E
# of heads: 4 (0,1,2,3)

Symptom: In accessible drive
Cause: corrupt glist, head 0 has read issues, bad sectors
Solution: cleared glist

Model: ST1000DM003
P/N: 1CH162-510
FW: CC47
Site: WU
SN: W1D
# of heads: 2 (0,1)

Symptom: Thrashing
Cause: Head crash
Solution: Unrecoverable